#!/usr/bin/python
# -*- coding: utf-8 -*-
"""
Auxiliary script used to send data between ports on guests.

:copyright: 2010 Red Hat, Inc.
:author: Jiri Zupka (jzupka@redhat.com)
:author: Lukas Doktor (ldoktor@redhat.com)
"""
from __future__ import division
import threading
from threading import Thread
import os
import select
import re
import random
import sys
import array
import stat
import traceback
import signal
import time
import platform
from distutils.version import LooseVersion  # pylint: disable=W0611,E0611

# For Python 2 and 3 compatibility
# xrange
try:
    range = xrange
except NameError:
    pass
# raw_input
try:
    input = raw_input
except NameError:
    pass
# iteritems, itervalues
if sys.version_info[0] == 3:
    def itervalues(d, **kw):
        return iter(d.values(**kw))

    def iteritems(d, **kw):
        return iter(d.items(**kw))
else:
    def itervalues(d, **kw):
        return d.itervalues(**kw)

    def iteritems(d, **kw):
        return d.iteritems(**kw)

if os.name == "posix":  # Linux
    os_linux = True
    import fcntl
else:   # Windows
    os_linux = False
    try:
        import win32file
    except ImportError as failure_detail:
        print("Import failed. Do you have ctypes and pywin32 installed?")
        raise failure_detail

DEBUGPATH = "/sys/kernel/debug"
SYSFSPATH = "/sys/class/virtio-ports/"
DEVPATH = "/dev/virtio-ports/"

exiting = False
virt = None


class VirtioGuest:

    """
    Test tools of virtio_ports.
    """
    LOOP_NONE = 0
    LOOP_POLL = 1
    LOOP_SELECT = 2
    LOOP_RECONNECT_NONE = 3

    def __init__(self):
        self.files = {}
        self.exit_thread = threading.Event()
        self.threads = []
        self.ports = {}
        self.poll_fds = {}
        self.catch_signal = None
        self.use_config = threading.Event()

    def init(self, in_files):
        """
        Init and check port properties.
        """
        raise NotImplementedError

    def _open(self, in_files):
        """
        Open devices and return array of descriptors

        :param in_files: Files array
        :return: Array of descriptor
        """
        raise NotImplementedError

    def poll(self, port, expected, timeout=500):
        """
        Checks the port POLL status and verify with expected results.

        :param port: Port name.
        :param expected: Expected POLL status (mask)
        """
        raise NotImplementedError

    def lseek(self, port, pos, how):
        """
        Use lseek on the device. The device is unseekable so PASS is returned
        when lseek command fails and vice versa.

        :param port: Name of the port
        :param pos: Offset
        :param how: Relative offset os.SEEK_{SET,CUR,END}
        """
        raise NotImplementedError

    def blocking(self, port, mode=False):
        """
        Set port function mode blocking/nonblocking

        :param port: port to set mode
        :param mode: False to set nonblock mode, True for block mode
        """
        raise NotImplementedError

    def asynchronous(self, port, mode=True, exp_val=0):
        """
        Set port function mode async/sync.

        :param port: port which should be pooled.
        :param mode: False to set sync mode, True for sync mode.
        :param exp_val: Value which should be pooled.
        """
        raise NotImplementedError

    def close(self, port_file):
        """
        Close open port.

        :param port_file: File to close.
        """
        raise NotImplementedError

    def open(self, in_file):
        """
        Direct open devices.

        :param in_file: Array of files.
        :return: Array of descriptors.
        """
        raise NotImplementedError

    def loopback(self, in_files, out_files, cachesize=1024,
                 mode=0):
        """
        Start a switch thread.

        (There is a problem with multiple opens of a single file).

        :param in_files: Array of input files.
        :param out_files: Array of output files.
        :param cachesize: Cachesize.
        :param mode: Mode of switch.
        """
        in_f = self._open(in_files)
        out_f = self._open(out_files)

        s = self.Switch(in_f, out_f, self.exit_thread, cachesize, mode)
        s.start()
        self.threads.append(s)
        print("PASS: Start switch")

    def exit_threads(self):
        """
        Function end all running data switch.
        """
        raise NotImplementedError

    def send_loop_init(self, port, length):
        """
        Prepares the sender thread. Requires clean thread structure.

        :param port: On which port to sent data
        :param length: length of data
        """
        raise NotImplementedError

    def send_loop(self):
        """
        Start sender data transfer. Requires senderprepare run first.
        """
        raise NotImplementedError

    def send(self, port, length=1, mode=True, is_static=False):
        """
        Send a data of arbitrary length

        :param port: Port to write data
        :param length: Length of data
        :param mode: True = loop mode, False = one shoot mode
        :param is_static: False = generates $length long block (mode=0)
                          True = generates 4096 long block (faster, mode=1)
        """
        raise NotImplementedError

    def recv(self, port, length=1, bfr=1024, mode=True):
        """
        Receive a data of arbitrary length.

        :param port: Port to write data
        :param length: Length of data
        :param mode: True = loop mode, False = one shoot mode
        """
        raise NotImplementedError

    def clean_port(self, port, bfr=1024):
        raise NotImplementedError


class VirtioGuestPosix(VirtioGuest):

    """
    Test tools of virtio_ports.
    """

    def _readfile(self, name):
        """
        Read file and return content as string

        :param name: Name of file
        :return: Content of file as string
        """
        out = ""
        try:
            f = open(name, "r")
            out = f.read()
            f.close()
        except Exception:
            print("FAIL: Cannot open file %s" % (name))

        return out

    def _get_port_status(self, in_files=None):
        """
        Get info about ports from kernel debugfs.

        :param in_files: Array of input files.
        :return: Ports dictionary of port properties
        """
        ports = {}
        current_version = LooseVersion(platform.uname()[2])
        fixed_version = LooseVersion("4.18.0-97")
        not_present_msg = "FAIL: There's no virtio-ports dir in debugfs"
        if not os.path.ismount(DEBUGPATH):
            os.system('mount -t debugfs none %s' % (DEBUGPATH))
        try:
            if not os.path.isdir('%s/virtio-ports' % (DEBUGPATH)):
                print(not_present_msg)
        except Exception:
            print(not_present_msg)
        else:
            viop_names = os.listdir('%s/virtio-ports' % (DEBUGPATH))
            if in_files is not None:
                dev_names = os.listdir('/dev')
                rep = re.compile(r"vport[0-9]+p[0-9]+")
                dev_names = list(
                    filter(lambda x: rep.match(x) is not None, dev_names))
                if len(dev_names) != len(in_files):
                    print("FAIL: Not all ports were successfully initialized "
                          "in /dev, only %d from %d." % (len(dev_names),
                                                         len(in_files)))
                    return

                if len(viop_names) != len(in_files):
                    print("FAIL: Not all ports were successfully initialized "
                          "in debugfs, only %d from %d." % (len(viop_names),
                                                            len(in_files)))
                    return

            for name in viop_names:
                open_db_file = "%s/virtio-ports/%s" % (DEBUGPATH, name)
                f = open(open_db_file, 'r')
                port = {}
                line_list = []
                for line in iter(f):
                    line_list.append(line)
                try:
                    for line in line_list:
                        m = re.match(r"(\S+): (\S+)", line)
                        port[m.group(1)] = m.group(2)

                    if port['is_console'] == "yes":
                        port_num = int(port["console_vtermno"])
                        if current_version >= fixed_version:
                            port_num -= 1
                        port["path"] = "/dev/hvc%d" % port_num
                        # Console works like a serialport
                    else:
                        port["path"] = "/dev/%s" % name

                    if not os.path.exists(port['path']):
                        print("FAIL: %s not exist" % port['path'])

                    sysfspath = SYSFSPATH + name
                    if not os.path.isdir(sysfspath):
                        print("FAIL: %s not exist" % (sysfspath))

                    info_name = sysfspath + "/name"
                    port_name = self._readfile(info_name).strip()
                    if port_name != port["name"]:
                        print("FAIL: Port info does not match "
                              "\n%s - %s\n%s - %s" %
                              (info_name, port_name,
                               "%s/virtio-ports/%s" % (DEBUGPATH, name),
                               port["name"]))
                    dev_ppath = DEVPATH + port_name
                    if not os.path.exists(dev_ppath):
                        print("FAIL: Symlink %s does not exist." % dev_ppath)
                    if not os.path.realpath(dev_ppath) != "/dev/name":
                        print("FAIL: Symlink %s is not correct." % dev_ppath)
                except AttributeError:
                    print("Bad data on file %s:\n%s. " %
                          (open_db_file, "".join(line_list).strip()))
                    print("FAIL: Bad data on file %s." % open_db_file)
                    return

                ports[port['name']] = port
                f.close()

        return ports

    def init(self, in_files):
        """
        Init and check port properties.
        """
        self.ports = self._get_port_status(in_files)

        if self.ports is None:
            return
        for item in in_files:
            if (item[1] != self.ports[item[0]]["is_console"]):
                print(self.ports)
                print("FAIL: Host console is not like console on guest side\n")
                return

        print("PASS: Init and check virtioconsole files in system.")

    class Switch(Thread):

        """
        Thread that sends data between ports.
        """

        def __init__(self, in_files, out_files, event,
                     cachesize=1024, method=0):
            """
            :param in_files: Array of input files.
            :param out_files: Array of output files.
            :param method: Method of read/write access.
            :param cachesize: Block to receive and send.
            """
            Thread.__init__(self, name="Switch")
            self.in_files = in_files[0]
            self.in_names = in_files[1]
            self.out_files = out_files[0]
            self.out_names = out_files[1]
            self.exit_thread = event
            self.method = method

            self.cachesize = cachesize

        def _none_mode(self):
            """
            Read and write to device in blocking mode
            """
            while not self.exit_thread.is_set():
                data = b""
                for desc in self.in_files:
                    data += os.read(desc, self.cachesize)
                if data != b"":
                    for desc in self.out_files:
                        os.write(desc, data)

        def _poll_mode(self):
            """
            Read and write to device in polling mode.
            """

            pi = select.poll()
            po = select.poll()

            for fd in self.in_files:
                pi.register(fd, select.POLLIN)

            for fd in self.out_files:
                po.register(fd, select.POLLOUT)

            while not self.exit_thread.is_set():
                data = b""
                t_out = self.out_files

                readyf = pi.poll(1.0)
                for i in readyf:
                    data += os.read(i[0], self.cachesize)

                if data != b"":
                    while ((len(t_out) != len(readyf)) and not
                           self.exit_thread.is_set()):
                        readyf = po.poll(1.0)
                    for desc in t_out:
                        os.write(desc, data)

        def _select_mode(self):
            """
            Read and write to device in selecting mode.
            """
            while not self.exit_thread.is_set():
                ret = select.select(self.in_files, [], [], 1.0)
                data = b""
                if ret[0] != []:
                    for desc in ret[0]:
                        data += os.read(desc, self.cachesize)
                if data != b"":
                    ret = select.select([], self.out_files, [], 1.0)
                    while ((len(self.out_files) != len(ret[1])) and not
                           self.exit_thread.is_set()):
                        ret = select.select([], self.out_files, [], 1.0)
                    for desc in ret[1]:
                        os.write(desc, data)

        def _reconnect_none_mode(self):
            """
            Read and write to device in blocking mode, close and reopen device
            when it get OSError.
            This is workaround for hotplugging of virtio port.
            """
            # TODO: Remove port unplugging after failure from guest_worker
            #       when bz796048 is resolved.
            while not self.exit_thread.is_set():
                data = b""
                for i in range(len(self.in_files)):
                    if self.exit_thread.is_set():
                        break
                    desc = self.in_files[i]
                    try:
                        data += os.read(desc, self.cachesize)
                    except OSError as inst:
                        if inst.errno == 9:
                            # Wait 0.1 before spoiling output with additional
                            # log information.
                            # time.sleep(0.5)
                            sys.stdout.write("FD closed, readerr %s\n" % inst)
                            while self.in_names[i] not in virt.files:
                                pass
                            self.in_files[i] = virt.files[self.in_names[i]]
                        else:
                            sys.stdout.write("Missing device, readerr %s\n"
                                             % inst)
                            _desc = desc
                            for item in iteritems(virt.files):
                                if item[1] == desc:
                                    path = item[0]
                                    break
                            for item in iteritems(virt.ports):
                                if item[1]['path'] == path:
                                    name = item[0]
                                    break
                            virt.close(name)
                            while not self.exit_thread.is_set():
                                try:
                                    desc = virt._open([name])[0]
                                    sys.stdout.write("PASS: Opened %s\n"
                                                     % name)
                                    break
                                except OSError:
                                    pass
                            self.in_files[self.in_files.index(_desc)] = desc
                if data != b"":
                    for i in range(len(self.out_files)):
                        if self.exit_thread.is_set():
                            break
                        desc = self.out_files[i]
                        written = False
                        while not written:
                            try:
                                if self.exit_thread.is_set():
                                    break
                                os.write(desc, data)
                                written = True
                            except OSError as inst:
                                if inst.errno == 9:
                                    # Wait 0.1 before spoiling output with
                                    # additional log information.
                                    # time.sleep(0.5)
                                    sys.stdout.write("FD closed, writeerr %s\n"
                                                     % inst)
                                    while self.out_names[i] not in virt.files:
                                        pass
                                    self.out_files[i] = virt.files[
                                        self.out_names[i]]
                                else:
                                    sys.stdout.write("Missing device, writeerr"
                                                     " %s\n" % inst)
                                    _desc = desc
                                    for item in iteritems(virt.files):
                                        if item[1] == desc:
                                            path = item[0]
                                            break
                                    for item in iteritems(virt.ports):
                                        if item[1]['path'] == path:
                                            name = item[0]
                                            break
                                    virt.close(name)
                                    while not self.exit_thread.is_set():
                                        try:
                                            desc = virt._open([name])[0]
                                            sys.stdout.write("PASS: Opened "
                                                             "%s\n" % name)
                                            break
                                        except OSError:
                                            pass
                                    _desc = self.out_files.index(_desc)
                                    self.out_files[_desc] = desc

        def run(self):
            if (self.method == VirtioGuest.LOOP_POLL):
                self._poll_mode()
            elif (self.method == VirtioGuest.LOOP_SELECT):
                self._select_mode()
            elif (self.method == VirtioGuest.LOOP_RECONNECT_NONE):
                self._reconnect_none_mode()
            elif (self.method == VirtioGuest.LOOP_NONE):
                self._none_mode()
            else:
                print("WARNIGN: Unknown mode %s, using LOOP_NONE" % self.method)
                self._reconnect_none_mode()

    class Sender(Thread):

        """
        Creates a thread which sends random blocks of data to dst port.
        """

        def __init__(self, port, event, length):
            """
            :param port: Destination port
            :param length: Length of the random data block
            """
            Thread.__init__(self, name="Sender")
            self.port = port
            self.exit_thread = event
            self.data = array.array('L')
            for _ in range(max(length // self.data.itemsize, 1)):
                self.data.append(random.randrange(sys.maxsize))

        def run(self):
            while not self.exit_thread.is_set():
                os.write(self.port, self.data)

    def _open(self, in_files):
        """
        Open devices and return array of descriptors

        :param in_files: Files array
        :return: Array of descriptor
        """
        f = []

        for item in in_files:
            path = self.ports[item]["path"]
            if (path in self.files):
                f.append(self.files[path])
            else:
                try:
                    self.files[path] = os.open(path, os.O_RDWR)
                    if (self.ports[item]["is_console"] == "yes"):
                        print(os.system("stty -F %s raw -echo" % (path)))
                        print(os.system("stty -F %s -a" % (path)))
                    f.append(self.files[path])
                except Exception as inst:
                    print("FAIL: Failed to open file %s" % (path))
                    raise inst
        return f

    @staticmethod
    def pollmask_to_str(mask):
        """
        Conver pool mast to string

        :param mask: poll return mask
        """
        out = ""
        if (mask & select.POLLIN):
            out += "IN "
        if (mask & select.POLLPRI):
            out += "PRI IN "
        if (mask & select.POLLOUT):
            out += "OUT "
        if (mask & select.POLLERR):
            out += "ERR "
        if (mask & select.POLLHUP):
            out += "HUP "
        if (mask & select.POLLMSG):
            out += "MSG "
        return out

    def poll(self, port, expected, timeout=500):
        """
        Pool event from device and print event like text.

        :param file: Device.
        """
        in_f = self._open([port])

        p = select.poll()
        p.register(in_f[0])

        mask = p.poll(timeout)

        maskstr = self.pollmask_to_str(mask[0][1])
        if (mask[0][1] & expected) == expected:
            print("PASS: Events: " + maskstr)
        else:
            emaskstr = self.pollmask_to_str(expected)
            print("FAIL: Events: " + maskstr + "  Expected: " + emaskstr)

    def lseek(self, port, pos, how):
        """
        Use lseek on the device. The device is unseekable so PASS is returned
        when lseek command fails and vice versa.

        :param port: Name of the port
        :param pos: Offset
        :param how: Relative offset os.SEEK_{SET,CUR,END}
        """
        fd = self._open([port])[0]

        try:
            os.lseek(fd, pos, how)
        except Exception as inst:
            if inst.errno == 29:
                print("PASS: the lseek failed as expected")
            else:
                print(inst)
                print("FAIL: unknown error")
        else:
            print("FAIL: the lseek unexpectedly passed")

    def blocking(self, port, mode=False):
        """
        Set port function mode blocking/nonblocking

        :param port: port to set mode
        :param mode: False to set nonblock mode, True for block mode
        """
        fd = self._open([port])[0]

        try:
            fl = fcntl.fcntl(fd, fcntl.F_GETFL)
            if not mode:
                fcntl.fcntl(fd, fcntl.F_SETFL, fl | os.O_NONBLOCK)
            else:
                fcntl.fcntl(fd, fcntl.F_SETFL, fl & ~os.O_NONBLOCK)

        except Exception as inst:
            print("FAIL: Setting (non)blocking mode: " + str(inst))
            return

        if mode:
            print("PASS: set to blocking mode")
        else:
            print("PASS: set to nonblocking mode")

    def __call__(self, sig, frame):
        """
        Call function. Used for signal handle.
        """
        if (sig == signal.SIGIO):
            self.sigio_handler(sig, frame)

    def sigio_handler(self, sig, frame):
        """
        Handler for sigio operation.

        :param sig: signal which call handler.
        :param frame: frame of caller
        """
        if self.poll_fds:
            p = select.poll()
            for fd_name in self.poll_fds.keys():
                p.register(fd_name)

            masks = p.poll(1)
            print(masks)
            for mask in masks:
                self.poll_fds[mask[0]][1] |= mask[1]

    def get_sigio_poll_return(self, port):
        """
        Return PASS, FAIL and poll walue in string format.

        :param port: Port to check poll information.
        """
        fd = self._open([port])[0]
        state = self.poll_fds[fd][:]
        print(state)
        end = time.time() + 5   # wait up to 5s for new signals
        while state[0] != state[1]:
            while time.time() < end:
                if state != self.poll_fds[fd]:  # new signal arrived
                    break
                time.sleep(0)   # schedule another thread
            else:
                print("FAIL: Timeout reached, Events: %s  Expected: %s"
                      % (self.pollmask_to_str(state[1]),
                         self.pollmask_to_str(state[0])))
                self.poll_fds[fd][1] = 0
                return
            state = self.poll_fds[fd][:]
            print(state)
        print("PASS: Events: " + self.pollmask_to_str(state[1]))
        self.poll_fds[fd][1] = 0

    def set_pool_want_return(self, port, poll_value):
        """
        Set value to static variable.

        :param port: Port which should be set excepted mask
        :param poll_value: Value to check sigio signal.
        """
        fd = self._open([port])[0]
        self.poll_fds[fd] = [poll_value, 0]
        print("PASS: Events: " + self.pollmask_to_str(poll_value))

    def catching_signal(self):
        """
        return: True if should set catch signal, False if ignore signal and
                none when configuration is not changed.
        """
        ret = self.catch_signal
        self.catch_signal = None
        return ret

    def asynchronous(self, port, mode=True, exp_val=0):
        """
        Set port function mode async/sync.

        :param port: port which should be pooled.
        :param mode: False to set sync mode, True for sync mode.
        :param exp_val: Value which should be pooled.
        """
        fd = self._open([port])[0]

        try:
            fcntl.fcntl(fd, fcntl.F_SETOWN, os.getpid())
            fl = fcntl.fcntl(fd, fcntl.F_GETFL)

            self.use_config.clear()
            if mode:
                self.catch_signal = True
                os.kill(os.getpid(), signal.SIGUSR1)
                self.use_config.wait()
                fcntl.fcntl(fd, fcntl.F_SETFL, fl | os.O_ASYNC)
                self.poll_fds[fd] = [exp_val, 0]
            else:
                del self.poll_fds[fd]
                fcntl.fcntl(fd, fcntl.F_SETFL, fl & ~os.O_ASYNC)
                self.catch_signal = False
                os.kill(os.getpid(), signal.SIGUSR1)
                self.use_config.wait()

        except Exception as inst:
            print("FAIL: Setting (a)sync mode: " + str(inst))
            return

        if mode:
            print("PASS: Set to async mode")
        else:
            print("PASS: Set to sync mode")

    def close(self, filepath):
        """
        Close open port.

        :param filepath: File to close.
        """
        descriptor = None
        path = self.ports[filepath]["path"]
        if path is not None:
            if path in list(self.files.keys()):
                descriptor = self.files[path]
                del self.files[path]
            if descriptor is not None:
                try:
                    os.close(descriptor)
                except Exception as inst:
                    print("FAIL: Closing the file: " + str(inst))
                    return
        print("PASS: Close")

    def open(self, in_file, attempts=1):
        """
        Direct open devices.

        :param in_file: Array of files.
        :return: Array of descriptors.
        """
        opened = False
        for i in range(attempts):
            try:
                name = self.ports[in_file]["path"]
                self.files[name] = os.open(name, os.O_RDWR)
                if (self.ports[in_file]["is_console"] == "yes"):
                    print(os.system("stty -F %s raw -echo" % (name)))
                opened = True
                break
            except Exception as exc:
                print(str(exc))
                time.sleep(0.1)
        if opened:
            print("PASS: All files opened correctly. (%d)" % i)
        else:
            print("FAIL: Failed open file %s" % name)

    def loopback(self, in_files, out_files, cachesize=1024,
                 mode=0):
        """
        Start a switch thread.

        (There is a problem with multiple opens of a single file).

        :param in_files: Array of input files.
        :param out_files: Array of output files.
        :param cachesize: Cachesize.
        :param mode: Mode of switch.
        """
        self.ports = self._get_port_status()

        in_f = self._open(in_files)
        out_f = self._open(out_files)
        in_files = [self.ports[item]["path"] for item in in_files]
        out_files = [self.ports[item]["path"] for item in out_files]

        s = self.Switch([in_f, in_files], [out_f, out_files], self.exit_thread,
                        cachesize, mode)
        s.start()
        self.threads.append(s)
        sys.stdout.write("PASS: Start switch\n")

    def exit_threads(self):
        """
        Function end all running data switch.
        """
        self.exit_thread.set()
        for th in self.threads:
            print("join %s" % th.name)
            th.join()
        self.exit_thread.clear()

        del self.threads[:]
        for desc in itervalues(self.files):
            os.close(desc)
        self.files.clear()
        print("PASS: All threads finished")

    def die(self):
        """
        Quit consoleswitch.
        """
        self.exit_threads()
        sys.exit(0)

    def send_loop_init(self, port, length):
        """
        Prepares the sender thread. Requires clean thread structure.
        """
        self.ports = self._get_port_status()
        in_f = self._open([port])

        self.threads.append(self.Sender(in_f[0], self.exit_thread, length))
        print("PASS: Sender prepare")

    def send_loop(self):
        """
        Start sender data transfer. Requires senderprepare run first.
        """
        self.threads[0].start()
        print("PASS: Sender start")

    def send(self, port, length=1, mode=True, is_static=False):
        """
        Send a data of some length

        :param port: Port to write data
        :param length: Length of data
        :param mode: True = loop mode, False = one shoot mode
        :param is_static: False = generates $length long block (mode=0)
                          True = generates 4096 long block (faster, mode=1)
        """
        in_f = self._open([port])

        data = b""
        writes = 0

        if not is_static:
            while len(data) < length:
                data += b"%c" % random.randrange(255)
            try:
                writes = os.write(in_f[0], data)
            except Exception as inst:
                print(inst)
        else:
            while len(data) < 4096:
                data += b"%c" % random.randrange(255)
        if mode:
            while (writes < length):
                try:
                    writes += os.write(in_f[0], data)
                except Exception as inst:
                    print(inst)
        if writes >= length:
            print("PASS: Send data length %d" % writes)
        else:
            print("FAIL: Partial send: desired %d, transferred %d" %
                  (length, writes))

    def recv(self, port, length=1, bfr=1024, mode=True):
        """
        Receive a data of arbitrary length.

        :param port: Port to write data
        :param length: Length of data
        :param mode: True = loop mode, False = one shoot mode
        """
        in_f = self._open([port])

        recvs = b""
        try:
            recvs = os.read(in_f[0], bfr)
        except Exception as inst:
            print(inst)
        if mode:
            while (len(recvs) < length):
                try:
                    recvs += os.read(in_f[0], bfr)
                except Exception as inst:
                    print(inst)
        if len(recvs) >= length:
            print("PASS: Recv data length %d" % len(recvs))
        else:
            print("FAIL: Partial recv: desired %d, transferred %d" %
                  (length, len(recvs)))

    def clean_port(self, port, bfr=1024):
        in_f = self._open([port])
        ret = select.select([in_f[0]], [], [], 1.0)
        buf = b""
        if ret[0]:
            buf = os.read(in_f[0], bfr)
        print("PASS: Rest in socket: " + str(buf[:10]))


class VirtioGuestNt(VirtioGuest):

    """
    Test tools of virtio_ports.
    """
    LOOP_NONE = 0
    LOOP_POLL = 0   # TODO: Use SELECT instead of NONE (poll not supp. by win)
    LOOP_SELECT = 0     # TODO: Support for Select

    def _get_port_status(self, in_files=[]):
        """
        Get info about ports.

        :param in_files: Array of input files.
        :return: Ports dictionary of port properties
        """
        ports = {}
        for in_file in in_files:
            port = {}
            port['path'] = "\\\\.\\%s" % in_file[0]
            port['name'] = in_file[0]
            port['is_console'] = in_file[1]
            ports[in_file[0]] = port

        return ports

    def init(self, in_files):
        """
        Init and check port properties.
        """
        # This only sets the ports names and paths
        # TODO: symlinks are sometimes missing, use /dev/vport%dp%d"
        self.ports = self._get_port_status(in_files)

        # Check if all ports really exists
        remove = []
        for item in iteritems(self.ports):
            port = item[1]
            try:
                hFile = win32file.CreateFile(port['path'], 0, 0, None,
                                             win32file.OPEN_EXISTING,
                                             win32file.FILE_ATTRIBUTE_NORMAL,
                                             None)
                win32file.CloseHandle(hFile)
            except win32file.error:
                remove.append(port['name'])
                print("Fail to open port %s" % port['name'])
        for name in remove:
            del (self.ports[name])

        # Check if in_files count and system port count matches
        # TODO: Not all devices are listed
        # TODO: Find the way to list all devices
        if remove:
            print("FAIL: Not all ports are present, check the log.")
            return
        """
        reg = _winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE, "System")
        reg = _winreg.OpenKey(reg, "CurrentControlSet")
        reg = _winreg.OpenKey(reg, "Services")
        reg = _winreg.OpenKey(reg, "VirtioSerial")
        reg = _winreg.OpenKey(reg, "Enum")
        virtio_port_count = _winreg.QueryValueEx(reg, "Count")[0]
        if virtio_port_count != len(self.ports):
            print("FAIL: Number of ports (%d) doesn't match the number"
                  " of ports in registry (%d)"
                  % (len(self.ports), virtio_port_count))
            return
        """

        print("PASS: Init and check virtioconsole files in system.")

    def close(self, filepath):
        """
        Close open port.

        :param filepath: File to close.
        """
        hFile = None
        path = self.ports[filepath]["path"]
        if path is not None:
            if path in list(self.files.keys()):
                hFile = self.files[path]
                del self.files[path]
            if hFile is not None:
                try:
                    win32file.CloseHandle(hFile)
                except win32file.error as inst:
                    print("FAIL: Closing the file: " + str(inst))
                    return
        print("PASS: Close")

    def _open(self, in_files):
        """
        Open devices and return array of descriptors

        :param in_files: List of port names
        :return: Array of descriptor
        """
        f = []

        for name in in_files:
            path = self.ports[name]["path"]
            if path in self.files:
                f.append(self.files[path])
            else:
                ret = self.open(name)
                if ret:
                    raise ret
                f.append(self.files[path])
        return f

    def open(self, name):
        """
        Direct open devices.

        :param name: Port name.
        :return: 0 on success
        """
        path = self.ports[name]['path']
        try:
            self.files[path] = win32file.CreateFile(path,
                                                    win32file.GENERIC_WRITE |
                                                    win32file.GENERIC_READ,
                                                    0,
                                                    None,
                                                    win32file.OPEN_EXISTING,
                                                    win32file.FILE_ATTRIBUTE_NORMAL,
                                                    None)
        except win32file.error as exc_detail:
            print("%s\nFAIL: Failed open file %s" % (str(exc_detail), name))
            return exc_detail
        print("PASS: All files opened correctly.")

    def exit_threads(self):
        """
        Function end all running data switch.
        """
        self.exit_thread.set()
        for th in self.threads:
            print("join")
            th.join()
        self.exit_thread.clear()

        del self.threads[:]
        for desc in itervalues(self.files):
            win32file.CloseHandle(desc)
        self.files.clear()
        print("PASS: All threads finished")

    class Switch(Thread):

        """
        Thread that sends data between ports.
        """

        def __init__(self, in_files, out_files, event,
                     cachesize=1024, method=0):
            """
            :param in_files: Array of input files.
            :param out_files: Array of output files.
            :param method: Method of read/write access.
            :param cachesize: Block to receive and send.
            """
            Thread.__init__(self, name="Switch")

            self.in_files = in_files
            self.out_files = out_files
            self.exit_thread = event
            self.method = method
            self.cachesize = cachesize

        def _none_mode(self):
            """
            Read and write to device in blocking mode
            """
            data = ""
            while not self.exit_thread.is_set():
                data = ""
                for desc in self.in_files:
                    ret, _data = win32file.ReadFile(desc, self.cachesize)
                    if ret:
                        msg = ("Error occurred while receiving data, "
                               "err=%s, read=%s" % (ret, _data))
                        print("FAIL: " + msg)
                        raise IOError(msg)
                    data += _data
                if data != "":
                    for desc in self.out_files:
                        ret, _data = win32file.WriteFile(desc, data)
                        if ret:
                            msg = ("Error occurred while sending data, "
                                   "err=%s, sentlen=%s" % (ret, _data))
                            print("FAIL: " + msg)
                            raise IOError(msg)

        def run(self):
            self._none_mode()

    class Sender(Thread):

        """
        Creates a thread which sends random blocks of data to dst port.
        """

        def __init__(self, port, event, length):
            """
            :param port: Destination port
            :param length: Length of the random data block
            """
            Thread.__init__(self, name="Sender")
            self.port = port
            self.exit_thread = event
            self.data = array.array('L')
            for _ in range(max(length // self.data.itemsize, 1)):
                self.data.append(random.randrange(sys.maxint))

        def run(self):
            while not self.exit_thread.is_set():
                if win32file.WriteFile(self.port, self.data)[0]:
                    msg = "Error occurred while sending data."
                    print("FAIL: " + msg)
                    raise IOError(msg)

    def send_loop_init(self, port, length):
        """
        Prepares the sender thread. Requires clean thread structure.
        """
        in_f = self._open([port])

        self.threads.append(self.Sender(in_f[0], self.exit_thread, length))
        print("PASS: Sender prepare")

    def send_loop(self):
        """
        Start sender data transfer. Requires senderprepare run first.
        """
        self.threads[0].start()
        print("PASS: Sender start")

    def send(self, port, length=1, mode=True, is_static=False):
        """
        Send a data of arbitrary length

        :param port: Port to write data
        :param length: Length of data
        :param mode: True = loop mode, False = one shoot mode
        :param is_static: False = generates $length long block (mode=0)
                          True = generates 4096 long block (faster, mode=1)
        """
        port = self._open([port])[0]

        data = ""
        writes = 0

        if not is_static:
            try:
                while len(data) < length:
                    data += "%c" % random.randrange(255)
                _ret, _len = win32file.WriteFile(port, data)
                if _ret:
                    msg = ("Error occurred while sending data, "
                           "err=%s, sentlen=%s" % (_ret, _len))
                    raise IOError(msg)
                writes = _len
            except Exception as inst:
                print(inst)
        else:
            while len(data) < 4096:
                data += "%c" % random.randrange(255)
        if mode:
            try:
                while (writes < length):
                    _ret, _len = win32file.WriteFile(port, data)
                    if _ret:
                        msg = ("Error occurred while sending data, err=%s"
                               ", sentlen=%s, allsentlen=%s" % (_ret, _len,
                                                                writes))
                        raise IOError(msg)
                    writes += _len
            except Exception as inst:
                print(inst)
        if writes >= length:
            print("PASS: Send data length %d" % writes)
        else:
            print("FAIL: Partial send: desired %d, transferred %d" %
                  (length, writes))

    def recv(self, port, length=1, buflen=1024, mode=True):
        """
        Receive a data of arbitrary length.

        :param port: Port to write data
        :param length: Length of data
        :param mode: True = loop mode, False = one shoot mode
        """
        port = self._open([port])[0]

        recvs = ""
        try:
            _ret, _data = win32file.ReadFile(port, buflen)
            if _ret:
                msg = ("Error occurred while receiving data, "
                       "err=%s, read=%s" % (_ret, _data))
                raise IOError(msg)
            recvs = _data
        except Exception as inst:
            print(inst)
        if mode:
            while (len(recvs) < length):
                try:
                    _ret, _data = win32file.ReadFile(port, buflen)
                    if _ret:
                        msg = ("Error occurred while receiving data, "
                               "err=%s, read=%s, allread=%s" % (_ret, _data,
                                                                len(recvs)))
                        raise IOError(msg)
                except Exception as inst:
                    print(inst)
        if len(recvs) >= length:
            print("PASS: Recv data length %d" % len(recvs))
        else:
            print("FAIL: Partial recv: desired %d, transferred %d" %
                  (length, len(recvs)))


def is_alive():
    """
    Check is only main thread is alive and if guest react.
    """
    if ((os_linux and (threading.active_count() == 2)) or
            ((not os_linux) and (threading.active_count() == 1))):
        print("PASS: Guest is ok no thread alive")
    else:
        threads = ""
        for thread in threading.enumerate():
            threads += thread.name + ", "
        print("FAIL: On guest run thread. Active thread:" + threads)


def guest_exit():
    """
    quit/finish/exit this script
    """
    global exiting
    exiting = True


def compile_script():
    """
    Compile virtio_console_guest.py to speed up.
    """
    import py_compile
    py_compile.compile(__file__, "%so" % __file__)
    print("PASS: compile")
    sys.exit(0)


def worker(virt):
    """
    Worker thread (infinite) loop of virtio_guest.
    """
    global exiting
    print("PASS: Daemon start.")
    p = select.poll()
    p.register(sys.stdin.fileno())
    while not exiting:
        d = p.poll()
        if (d[0][1] == select.POLLIN):
            out = input()
            try:
                exec(out)
            except Exception:
                exc_type, exc_value, exc_traceback = sys.exc_info()
                print("On Guest exception from: \n" + "".join(
                    traceback.format_exception(exc_type,
                                               exc_value,
                                               exc_traceback)))
                print("FAIL: Guest command exception.")
        elif (d[0][1] & select.POLLHUP):
            time.sleep(0.5)


def sigusr_handler(sig, frame):
    pass


class Daemon:

    """
    Daemonize guest
    """

    def __init__(self, stdin, stdout, stderr):
        """
        Init daemon.

        :param stdin: path to stdin file.
        :param stdout: path to stdout file.
        :param stderr: path to stderr file.
        """
        self.stdin = stdin
        self.stdout = stdout
        self.stderr = stderr

    @staticmethod
    def is_file_open(path):
        """
        Determine process which open file.

        :param path: Path to file.
        :return: [[pid,mode], ... ].
        """
        opens = []
        pids = os.listdir('/proc')
        for pid in sorted(pids):
            try:
                int(pid)
            except ValueError:
                continue
            fd_dir = os.path.join('/proc', pid, 'fd')
            try:
                for filepath in os.listdir(fd_dir):
                    try:
                        p = os.path.join(fd_dir, filepath)
                        link = os.readlink(os.path.join(fd_dir, filepath))
                        if link == path:
                            mode = os.lstat(p).st_mode
                            opens.append([pid, mode])
                    except OSError:
                        continue
            except OSError as e:
                if e.errno == 2:
                    continue
                raise
        return opens

    def daemonize(self):
        """
        Run guest as a daemon.
        """
        try:
            pid = os.fork()
            if pid > 0:
                return False
        except OSError as e:
            sys.stderr.write("Daemonize failed: %s\n" % (e))
            sys.exit(1)

        os.chdir("/")
        os.setsid()
        os.umask(0)

        try:
            pid = os.fork()
            if pid > 0:
                sys.exit(0)
        except OSError as e:
            sys.stderr.write("Daemonize failed: %s\n" % (e))
            sys.exit(1)

        sys.stdout.flush()
        sys.stderr.flush()
        si = open(self.stdin, 'r')
        so = open(self.stdout, 'w')
        se = open(self.stderr, 'w')

        os.dup2(si.fileno(), sys.stdin.fileno())
        os.dup2(so.fileno(), sys.stdout.fileno())
        os.dup2(se.fileno(), sys.stderr.fileno())

        si.close()
        so.close()
        se.close()

        sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 1)
        sys.stderr = os.fdopen(sys.stderr.fileno(), 'w', 1)
        return True

    def start(self):
        """
        Start the daemon

        :return: PID of daemon.
        """
        # Check for a pidfile to see if the daemon already runs
        openers = self.is_file_open(self.stdout)
        rundaemon = False
        if len(openers) > 0:
            for i in openers:
                if i[1] & stat.S_IWUSR:
                    rundaemon = True
                    openers.remove(i)
            if len(openers) > 0:
                for i in openers:
                    os.kill(int(i[0]), 9)
        time.sleep(0.3)

        # Start the daemon
        if not rundaemon:
            if self.daemonize():
                self.run()

    def run(self):
        """
        Run guest main thread
        """
        global virt
        global exiting
        virt = VirtioGuestPosix()
        slave = Thread(target=worker, args=(virt,))
        slave.start()
        signal.signal(signal.SIGUSR1, sigusr_handler)
        signal.signal(signal.SIGALRM, sigusr_handler)
        while not exiting:
            signal.alarm(1)
            signal.pause()
            catch = virt.catching_signal()
            if catch:
                signal.signal(signal.SIGIO, virt)
            elif catch is False:
                signal.signal(signal.SIGIO, signal.SIG_DFL)
            if catch is not None:
                virt.use_config.set()
        print("PASS: guest_exit")
        sys.exit(0)


def main():
    """
    Main function for OS Linux with infinite loop to catch signal from system.
    """
    stdin = "/tmp/guest_daemon_pi"
    stdout = "/tmp/guest_daemon_po"
    stderr = "/tmp/guest_daemon_pe"

    for f in [stdin, stdout, stderr]:
        try:
            os.mkfifo(f)
        except OSError as e:
            if e.errno == 17:
                pass

    daemon = Daemon(stdin,
                    stdout,
                    stderr)
    daemon.start()

    d_stdin = os.open(stdin, os.O_WRONLY)
    d_stdout = os.open(stdout, os.O_RDONLY)
    d_stderr = os.open(stderr, os.O_RDONLY)

    s_stdin = sys.stdin.fileno()
    s_stdout = sys.stdout.fileno()
    s_stderr = sys.stderr.fileno()

    pid = filter(lambda x: x[0] != str(os.getpid()),
                 daemon.is_file_open(stdout))
    pid = list(pid)[0][0]

    print("PASS: Start")

    while 1:
        ret = select.select([d_stderr,
                             d_stdout,
                             s_stdin],
                            [], [], 1.0)
        if s_stdin in ret[0]:
            os.write(d_stdin, os.read(s_stdin, 1))
        if d_stdout in ret[0]:
            os.write(s_stdout, os.read(d_stdout, 1024))
        if d_stderr in ret[0]:
            os.write(s_stderr, os.read(d_stderr, 1024))
        if not os.path.exists("/proc/" + pid):
            sys.exit(0)

    os.close(d_stdin)
    os.close(d_stdout)
    os.close(d_stderr)


def main_nt():
    """
    Main function for Windows NT with infinite loop.
    """
    global virt
    global exiting
    virt = VirtioGuestNt()
    print("PASS: Start")
    sys.stdout.flush()
    while not exiting:
        try:
            exec(input())
        except Exception:
            exc_type, exc_value, exc_traceback = sys.exc_info()
            print("On Guest exception from: \n" + "".join(
                traceback.format_exception(exc_type,
                                           exc_value,
                                           exc_traceback)))
            print("FAIL: Guest command exception.")
        sys.stdout.flush()
    print("PASS: guest_exit")
    sys.exit(0)


if __name__ == "__main__":
    if (len(sys.argv) > 1) and (sys.argv[1] == "-c"):
        compile_script()

    if os_linux:    # Linux
        main()
    else:   # Windows
        main_nt()
